Motion detection with camera in Raspberry Pi - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the library needed to work with the Raspberry Pi camera.

Raspberry Pi

import [1]

Drag options to blanks, or click blank then click option'

Apicamera

Btime

Cos

Dsys

Attempts:

3 left

💡 Hint

Common Mistakes

Importing unrelated libraries like 'time' or 'os' instead of 'picamera'.

The picamera library is used to control the Raspberry Pi camera module.

2fill in blank

medium

Complete the code to start the camera preview so you can see what the camera sees.

Raspberry Pi

camera = picamera.PiCamera()
camera.[1]()

Drag options to blanks, or click blank then click option'

Aclose

Bcapture

Cstart_preview

Dstop_preview

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'capture' which takes a photo instead of showing live preview.

The start_preview() method shows the camera's live view on the screen.

3fill in blank

hard

Fix the error in the code to capture an image and save it as 'image.jpg'.

Raspberry Pi

camera.capture([1])

Drag options to blanks, or click blank then click option'

A'image.jpg'

B'image.png'

Cimage.jpg

Dimage.png

Attempts:

3 left

💡 Hint

Common Mistakes

Not putting quotes around the filename causes a NameError.

The filename must be a string, so it needs quotes like 'image.jpg'.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that stores the length of each word longer than 3 letters.

Raspberry Pi

lengths = {word: [1] for word in words if len(word) [2] 3}

Drag options to blanks, or click blank then click option'

Alen(word)

B>

C<

Dword

Attempts:

3 left

💡 Hint

Common Mistakes

Using the word itself as value instead of its length.

Using '<' instead of '>' in the condition.

The dictionary stores word lengths, so use len(word). The condition checks words longer than 3, so use >.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that stores uppercase words and their lengths only if length is greater than 4.

Raspberry Pi

result = [1]: [2] for word in words if len(word) [3] 4}

Drag options to blanks, or click blank then click option'

Aword.upper()

Blen(word)

C>

Dword

Attempts:

3 left

💡 Hint

Common Mistakes

Using the word as key without uppercase.

Using '<' instead of '>' in the condition.

The key is the uppercase word (word.upper()), the value is the length (len(word)), and the condition checks length greater than 4 (>).